EV install on a TT system - DNO PME?

Zoomup: 
Wasn't yellow used as a C.P.C. because it was already half of the green and yellow for earth anyway? Oversleeved with green and yellow it is quite suitable.

Why oversleeve it? Just use a green Sharpie! ?

AJJewsbury: 
 

I never use green and yellow as a live conductor, sleeved or not.

Probably no riskier than over-sleeving a ‘live’ colour with G/Y and using as a c.p.c. …. just that the danger comes from mistakes at the opposite end of the cable.

    - Andy.

I was thinking of 514.4.2 Mr. J.

Z.

Chris Pearson: 
 

Zoomup: 
Wasn't yellow used as a C.P.C. because it was already half of the green and yellow for earth anyway? Oversleeved with green and yellow it is quite suitable.

Why oversleeve it? Just use a green Sharpie! ?

You should patent that idea Chris.

Z.

I was thinking of 514.4.2 Mr. J.

That only applies to single-core cables (where you have the option to select a cable with a less inappropriate colouring of its one core) not to one core of multi-core cables (where the choice of core colours for a cable of a given number of cores tends to be rather limited (by standards, manufacturers and distributors)). In situations where PE isn't necessary (SELV for instance) having to buy a cable with more cores than needed just to avoid using a G/Y one is unnecessarily wasteful of resources.

   - Andy.

Probably the black was sleeved blue from the old colour code standard for Neutral. There's some logic even if it's poor practice since there's no confusion for the Brown connection leaving the third conductor as Earth to be sleeved appropriately. The sleeving obviously needs to provide correct identification at each end! I usually over sleeve old Red and Black T+E if re terminating a socket using Brown and Blue heat shrink sleeving but leave some of the original cable visible.

I remember being given an old electric fan heater as a young lad in 1970s from my uncle returning from a posting in Germany. I had to delve in to the innards to work out which colours to use for the plug as it was completely different to UK cable standards. I vaguely remember it possibly having red blue and yellow for the colours. Anyway it worked and I didn't get electrocuted. Mind you the oscilloscope cathode ray tube he gave me required construction of a 1.5kV DC supply in which I connected an electrolytic capacitor the wrong way in a voltage doubler. Good job it was contained in a metal case when it exploded.

Old German colour codes, red earth, black live, cream or grey neutral.

Sadly a colleague of my father was a lot less lucky in the early 1970s when a UK plug (red live, black neutral, the other one must be earth  no ? ) was put on a German made submersible pump and he carried it into water. 

Mike.

AJJewsbury: 
 

I was thinking of 514.4.2 Mr. J.

That only applies to single-core cables (where you have the option to select a cable with a less inappropriate colouring of its one core) not to one core of multi-core cables (where the choice of core colours for a cable of a given number of cores tends to be rather limited (by standards, manufacturers and distributors)). In situations where PE isn't necessary (SELV for instance) having to buy a cable with more cores than needed just to avoid using a G/Y one is unnecessarily wasteful of resources.

   - Andy.

“The bi-colour combination green-and-yellow shall be used exclusively for identification of a protective conductor, and this combination shall not be used for any other purpose."

Z.

Zoomup: 
 

AJJewsbury: 
 

I was thinking of 514.4.2 Mr. J.

That only applies to single-core cables (where you have the option to select a cable with a less inappropriate colouring of its one core) not to one core of multi-core cables (where the choice of core colours for a cable of a given number of cores tends to be rather limited (by standards, manufacturers and distributors)). In situations where PE isn't necessary (SELV for instance) having to buy a cable with more cores than needed just to avoid using a G/Y one is unnecessarily wasteful of resources.

   - Andy.

“The bi-colour combination green-and-yellow shall be used exclusively for identification of a protective conductor, and this combination shall not be used for any other purpose."

Z.

Indeed - and no issue there - where a core is marked at the terminations it's the marking (sleeving) that provides the identification, not the underlying insulation colour.

   - Andy.

AJJewsbury: 
 

Zoomup: 
 

AJJewsbury: 
 

I was thinking of 514.4.2 Mr. J.

That only applies to single-core cables (where you have the option to select a cable with a less inappropriate colouring of its one core) not to one core of multi-core cables (where the choice of core colours for a cable of a given number of cores tends to be rather limited (by standards, manufacturers and distributors)). In situations where PE isn't necessary (SELV for instance) having to buy a cable with more cores than needed just to avoid using a G/Y one is unnecessarily wasteful of resources.

   - Andy.

“The bi-colour combination green-and-yellow shall be used exclusively for identification of a protective conductor, and this combination shall not be used for any other purpose."

Z.

Indeed - and no issue there - where a core is marked at the terminations it's the marking (sleeving) that provides the identification, not the underlying insulation colour.

   - Andy.

And mid route?

514.3.2 “Every core of a cable shall be identifiable at its terminations AND PREFERABLY THROUGHOUT ITS LENGTH.” (Caps. mine).

Z.

And mid route?

514.3.2 “Every core of a cable shall be identifiable at its terminations AND PREFERABLY THROUGHOUT ITS LENGTH.” (Caps. mine)

and…?

Whenever you over-sleeve the ends you loose the ability to see the identification mid-route - where it be blue oversleeved brown on switch drops, black oversleeved G/Y in SWA, or G/Y oversleeved something else. As it's nigh-on impossible to get manufactured multi-core cables with just the core colours we want for every situation, something has to give - so it's only a preference in BS 7671 rather than a requirement. Nothing special for G/Y cores.

   - Andy.